mirror of
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100 lines
2.3 KiB
C++
100 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsSupportsArrayEnumerator.h"
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#include "nsISupportsArray.h"
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nsSupportsArrayEnumerator::nsSupportsArrayEnumerator(nsISupportsArray* array)
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: mArray(array), mCursor(0)
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{
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NS_ASSERTION(array, "null array");
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NS_ADDREF(mArray);
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}
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nsSupportsArrayEnumerator::~nsSupportsArrayEnumerator()
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{
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NS_RELEASE(mArray);
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}
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NS_IMPL_ISUPPORTS2(nsSupportsArrayEnumerator, nsIBidirectionalEnumerator, nsIEnumerator)
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NS_IMETHODIMP
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nsSupportsArrayEnumerator::First()
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{
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mCursor = 0;
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uint32_t cnt;
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nsresult rv = mArray->Count(&cnt);
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if (NS_FAILED(rv)) return rv;
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int32_t end = (int32_t)cnt;
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if (mCursor < end)
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return NS_OK;
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else
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return NS_ERROR_FAILURE;
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}
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NS_IMETHODIMP
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nsSupportsArrayEnumerator::Next()
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{
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uint32_t cnt;
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nsresult rv = mArray->Count(&cnt);
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if (NS_FAILED(rv)) return rv;
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int32_t end = (int32_t)cnt;
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if (mCursor < end) // don't count upward forever
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mCursor++;
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if (mCursor < end)
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return NS_OK;
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else
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return NS_ERROR_FAILURE;
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}
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NS_IMETHODIMP
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nsSupportsArrayEnumerator::CurrentItem(nsISupports **aItem)
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{
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NS_ASSERTION(aItem, "null out parameter");
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uint32_t cnt;
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nsresult rv = mArray->Count(&cnt);
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if (NS_FAILED(rv)) return rv;
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if (mCursor >= 0 && mCursor < (int32_t)cnt) {
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return mArray->GetElementAt(mCursor, aItem);
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}
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return NS_ERROR_FAILURE;
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}
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NS_IMETHODIMP
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nsSupportsArrayEnumerator::IsDone()
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{
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uint32_t cnt;
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nsresult rv = mArray->Count(&cnt);
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if (NS_FAILED(rv)) return rv;
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// XXX This is completely incompatible with the meaning of nsresult.
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// NS_ENUMERATOR_FALSE is defined to be 1. (bug 778111)
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return (mCursor >= 0 && mCursor < (int32_t)cnt)
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? (nsresult)NS_ENUMERATOR_FALSE : NS_OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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NS_IMETHODIMP
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nsSupportsArrayEnumerator::Last()
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{
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uint32_t cnt;
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nsresult rv = mArray->Count(&cnt);
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if (NS_FAILED(rv)) return rv;
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mCursor = cnt - 1;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsSupportsArrayEnumerator::Prev()
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{
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if (mCursor >= 0)
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--mCursor;
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if (mCursor >= 0)
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return NS_OK;
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else
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return NS_ERROR_FAILURE;
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}
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